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Simplifying x2 + 3x + a = 0 Reorder the terms: a + 3x + x2 = 0 Solving a + 3x + x2 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3x' to each side of the equation. a + 3x + -3x + x2 = 0 + -3x Combine like terms: 3x + -3x = 0 a + 0 + x2 = 0 + -3x a + x2 = 0 + -3x Remove the zero: a + x2 = -3x Add '-1x2' to each side of the equation. a + x2 + -1x2 = -3x + -1x2 Combine like terms: x2 + -1x2 = 0 a + 0 = -3x + -1x2 a = -3x + -1x2 Simplifying a = -3x + -1x2
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